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MSG and stability - RF Cafe Forums

Because of the high maintenance needed to monitor and filter spammers from the RF Cafe Forums, I decided that it would be best to just archive the pages to make all the good information posted in the past available for review. It is unfortunate that the scumbags of the world ruin an otherwise useful venue for people wanting to exchanged useful ideas and views. It seems that the more formal social media like Facebook pretty much dominate this kind of venue anymore anyway, so if you would like to post something on RF Cafe's Facebook page, please do.

Below are all of the forum threads, including all the responses to the original posts.


jkfelix
Post subject: MSG and stability Posted: Sun Feb 12, 2006 11:27 am

Lieutenant

Joined: Thu Feb 09, 2006 5:29 am
Posts: 1
Hi guys,

My transistor is the NE4210S01, bias point VDS = 2 V, ID = 10 mA and at 6 GHz.

I'm doing an availabe gain (Ga) design, keeping my load complex conj of the output reflection, and draw the constant gain circles in the GammaS plane:

I see that the gain circle corresponding to the MSG has some parts inside the stable region. Picking values of GammaS so that I have higher gain than the MSG, I get some GammaL according to the perfect match at the output - and this is also in the stable region! So I have stability both at the input and the output, even though choosing points on having higher gain than the MSG!

Can this be, and if so - why oh why?

sincerely,
RF-student

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Posted  11/12/2012
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